How Many Days in a Month
Quick answer: 28-31 days — with memory tricks
⚡Quick Answer
31 days: Jan, Mar, May, Jul, Aug, Oct, Dec. 30 days: Apr, Jun, Sep, Nov. 28/29 days: February.
Step-by-Step Guide
The Quick Answer
31 days: January, March, May, July, August, October, December (7 months) | 30 days: April, June, September, November (4 months) | 28/29 days: February
The Knuckle Trick
Make fists and look at your knuckles. Starting from January on the first knuckle: knuckle = 31 days, valley = 30 days (except Feb). Skip thumb gap!
The Classic Rhyme
'Thirty days hath September, April, June, and November. All the rest have 31, except February alone, which has 28 days clear, and 29 in each leap year.'
Average Month
Average month = 30.44 days (365 ÷ 12). For business: often 30 days assumed. For billing: usually 28-31 actual days.
Frequently Asked Questions
Why does February have 28 days?
In the Roman calendar, February was the last month. Days were taken from it to give July (Julius Caesar) and August (Augustus) 31 days each.
When does February have 29 days?
In leap years: every 4 years, except century years not divisible by 400. So 2024, 2028, 2032 are leap years; 2100 is not.
How many weeks in a month?
About 4.33 weeks on average. Exactly 4 weeks only in a 28-day February.